/*    
    OpenMheg - A free MHEG-5 library
    Copyright (C) 2008 Dharmesh Malam

    This program is free software: you can redistribute it and/or modify
    it under the terms of the GNU General Public License as published by
    the Free Software Foundation, either version 3 of the License, or
    (at your option) any later version.

    This program is distributed in the hope that it will be useful,
    but WITHOUT ANY WARRANTY; without even the implied warranty of
    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
    GNU General Public License for more details.

    You should have received a copy of the GNU General Public License
    along with this program.  If not, see <http://www.gnu.org/licenses/>.
*/

using System;
using System.Collections.Generic;
using System.Text;
using Core.Model.Data.Type;
using Core.Model.Data.Variables;

namespace Core.Model.Data.Generics
{
    public class GenericObjectRef : Generic
    {
        private ObjectRef value = null;

        private ObjectRef indirectReference = null;

        public GenericObjectRef (ObjectRef direct , ObjectRef indirectReference)
        {
            this.value = direct;
            this.indirectReference = indirectReference;

            System.Diagnostics.Debug.Assert( !(value == null && indirectReference == null) );
        }

        public ObjectRef Value
        {
            get
            {
                ObjectRef ret = null;

                try
                {
                    ret = value ?? ( ( ObjectRefVariable ) MHEGEngine.Instance.Find( indirectReference ) ).Value;
                }

                catch ( InvalidCastException e )
                {
                    log.Error( "Indirect value is not "+value.GetType()+", when trying to dereference"+GetType()+". Returning null.", e );

                }
                catch ( NullReferenceException e )
                {
                    log.Error( "Direct and indriect value equal null when trying to dereference "+GetType()+".Returning null.", e );
                }

                return ret;
            }
            set
            {
                if ( indirectReference != null )
                {
                    try
                    {
                        ObjectRefVariable objectRefVariable = ( ObjectRefVariable ) MHEGEngine.Instance.Find( indirectReference );
                        objectRefVariable.Value =  value;
                    }
                    catch ( InvalidCastException e )
                    {
                        log.Error( "Indirect value is not "+this.value.GetType()+", when trying to dereference"+GetType()+".", e );
                    }
                }
                else
                {
                    this.value = value ;
                }
            }

        }
        public override string ToString ()
        {
            return Value.ToString() +" Direct:"+ ( value!=null ).ToString();
        }

    }
}
